Impact of Hydrothermal Aging on SO2 Poisoning over Cu-SSZ-13 Diesel Exhaust SCR Catalysts

Lai Wei, Dongwei Yao, Feng Wu, Biao Liu, Xiaohan Hu, Xingwen Li, Xinlei Wang

Research output: Contribution to journalArticlepeer-review


The impact of hydrothermal aging on SO2 poisoning over Cu-SSZ-13 selective catalytic reduction (SCR) catalysts were investigated in this study. The catalyst samples were hydrothermally aged at various temperatures for SO2 poisoning and characterized by SO2 temperature-programmed desorption (SO2-TPD), X-ray diffraction (XRD), H2 temperature-programmed reduction (H2-TPR), and NH3-TPD. The performance evaluations were also performed to illustrate the impact on SCR activity and oxidation. The results showed that the Cu-SO4-like species decreased in the 750 °C aged sample via copper migration, while they increased in the 850 °C aged sample due to CuOX/CuAlOX formation. The low-temperature SCR activity and oxidation decreased due to sulfur poisoning. For the sulfated sample, however, it was determined that NOX conversion was slightly higher on the mildly hydrothermally aged sample. Furthermore, desulfation is easier for the mildly hydrothermally aged sample but more difficult for the severely hydrothermally aged sample.

Original languageEnglish (US)
Pages (from-to)3949-3958
Number of pages10
JournalIndustrial and Engineering Chemistry Research
Issue number10
StatePublished - Mar 13 2019

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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